Objective lens driving apparatus with reinforcing rib and restraining part for focusing coil or tracking coil

ABSTRACT

To provide an inexpensive and easily manufaturable objective lens driving apparatus. It has a configuration wherein a reinforcing rib part for reinforcing a coil restraining part of a support printed board is formed on a lens holder and ends of windings of a focusing coil and a tracking coil are wound around the support printed board and the reinforcing rib part in bundle for restraining.

TECHNICAL FIELD

This invention relates to an objective lens driving apparatus fordriving an objective lens in response to an applied control signal andperforming focusing and tracking with respect to an optical datarecording medium and its manufacturing method.

BACKGROUND ART

These days, optical disk apparatus (e.g. DVD disk apparatus) that mountsan optical pickup (including an objective lens) for recording a signalonto or reproducing a signal from an optical data record medium (e.g.optical disk such as DVD disk) is now in increasing demand.

These optical disk apparatus have an objective lens driving apparatusfor driving an objective lens in response to a control signal andperforming focusing control and tracking control.

This invention relates to an objective lens driving apparatus, andparticularly to the configuration of a support printed board and itsperiphery for restraining the ends of windings of a focusing coil or atracking coil of the objective lens driving apparatus.

An Official Gazette of Japanese Laid-open Public Patent Application Hei5-342607 describes a conventional objective lens driving apparatushaving a support printed board for restraining the ends of windings of afocusing coil or a tracking coil.

The configuration will be explained hereinafter.

FIG. 14(a) shows a front view of the conventional objective lens drivingapparatus described in the Official Gazette of Japanese Laid-open PublicPatent Application Hei 5-342607.

FIG. 14(b) shows a bottom view of the conventional objective lensdriving apparatus described in the Official Gazette of JapaneseLaid-open Public Patent Application Hei 5-342607.

FIG. 14(c) shows a left side view of the conventional objective lensdriving apparatus described in the Official Gazette of JapaneseLaid-open Public Patent Application Hei 5-342607.

In FIG. 14, 1 is an objective lens and 2 is a lens holder to which theobjective lens 1 are attached.

A focusing coil 3 for driving the objective lens 1 in the focusingdirection (a direction of an arrow shown in FIG. 14, that is, the samedirection as that of optical axis of the objective lens 1) and atracking coil 4 for driving the objective lens 1 in the trackingdirection (a direction of an arrow shown in FIG. 14) are wound aroundthe lens holder 2.

Two support printed boards 5 are fixed at two positions indicated by atip of arrow of the lens holder 2.

The starting ends and the terminating ends of windings of the focusingcoil 3 and the tracking coil 4 are restrained by winding a few turnsalong coil restraining parts, which are located in the vicinity of thefront end parts of the support printed boards 5 protruded from the topsurface and the bottom surface of the lens holder 2.

6 is a fixed member which is comprised of a printed board and referredto as an act printed board. As shown in the left side view, the actprinted board 6 has four patterns, each pattern having a land part and athrough hole formed in the center or its periphery of the land part atone end.

7 is a support block which has a recessed part injected with dampermaterial 8 therein and four through holes are formed in said recessedpart. The act printed board 6 and the support block 7 are fixed so thatfour through holes of the act printed board 6 and four through holes ofthe support block 7, respectively, are placed coaxially.

Each end of four suspension wires 9 made of conductive metal wire isfixed to the act printed board 6 by soldering through the through holeof the act printed board 6 and the through hole of the support block 7at one end, and is fixed to the coil restraining part of the supportprinted board 5 by soldering at the other end.

With the above-mentioned configuration, it is possible to obtain aconductive path which starts from one of the patterns of the act printedboard 6, through 2 suspension wires 9 connected thereto, a land part ofthe support printed board 5 connected to the suspension wire 9, thefocusing coil 3 connected to the land part of the support printed board5, other land part of the support printed board 5 connected to other endof the focusing coil 3, other suspension wire 9 connected to the otherland part of the support printed board 5, and returns to other one ofthe patterns of the act printed board 6 connected to the othersuspension wire 9.

By feeding current of a focusing control signal to this path, focusingcontrol of the objective lens 1 can be achieved.

Similarly as the focusing control signal, by feeding current of atracking control signal to the conductive path containing the other twopatterns of the act printed board 6, the other two suspension wires 9,the other two land parts of the support printed board 5, and thetracking coil 4, tracking control of the objective lens 1 can beachieved.

Furthermore, the support block 7 is fixed to a yoke 10 at the positionas shown in the figure.

The lens holder 2 is supported by four suspension wires 9 so as to belocated at the center between permanent magnets 11 and 12.

A magnetic circuit consisting of the permanent magnets 11 and 12, andthe yoke 10 provided as an adjunct with the permanent magnets 11 and 12generates a substantially uniform magnetic field in the vicinity of thefocusing coil 3 and the tracking coil 4.

By feeding a focusing control signal to the focusing coil 3 within theuniform magnetic field, Lorentz force is generated, thereby producing atorque for driving the lens holder 2 in the focusing direction.

Likewise, by feeding a tracking control signal to the tracking coil 4within the uniform magnetic field, Lorentz force is generated, therebyproducing a torque for driving the lens holder 2 in the trackingdirection.

As four suspension wires 9 are made of flexible metal wire, the lensholder 2 undergoes displacement due to the above-mentioned torqueactuation.

Moreover, in the case that windings of the focusing coil 3 and thetracking coil 4 are wound by an automatic winder, parts of the supportprinted board 5 are configured to protrude from the lens holder 2 andthe parts neighboring to the front ends of the protruded support printedboard act as coil restraining parts, thereby facilitating restraint ofthe starting ends and the terminating ends of windings.

The objective lens driving apparatus is required to improve trackingsensitivity for corresponding to high-speed playback. As a solution, itis effective to reduce weight of the movable body.

Specific measures are thinning of the lens holder and weight reductionin the support printed board.

However, weight reduction causes rigidity degradation of the movablebody, resulting in the deterioration of high-order resonancecharacteristic of the objective lens driving apparatus. Althoughthinning of the lens holder and weight reduction in the support printedboard are effective in improving tracking sensitivity, these membersbecome less integrated.

As a result, the coil restraining part of the support printed boardwhich protrudes from the lens holder has a separate vibration mode athigh frequencies.

For that reason, with respect to the vibration characteristic of theobjective lens driving apparatus, undesired resonance and disturbance inphase occur and tracking performance of the objective lens drivingapparatus for the optical data recording medium deteriorates. Further,there is the possibility of consuming electricity unnecessary fortracking.

On the other hand, in order to facilitate the arrangement of thestarting ends and the terminating ends of the windings of the coilswound by an automatic winder, it is desirable to configure the coilrestraining part of the support printed board to protrude from the lensholder as mentioned above.

An object of the present invention is to provide an inexpensive andeasily manufacturable objective lens driving apparatus which isexcellent in tracking sensitivity and free from the undesired resonancemode and so on.

Another object of the present invention is to provide an inexpensivemanufacturing method for manufacturing an objective lens drivingapparatus which is excellent in tracking sensitivity and free from theundesired resonance mode and so on without adding new process.

DISCLOSURE OF INVENTION

A first invention is an objective lens driving apparatus characterizedby comprising an objective lens, a lens holder for holding saidobjective lens, a focusing coil with a central axis substantiallyparallel to the focusing direction of said objective lens, a trackingcoil with a central axis substantially parallel to the trackingdirection of said objective lens, a magnet for generating a magneticfield in the vicinity of said focusing coil and tracking coil, a supportprinted board having coil restraining parts which protrudes from sidesurfaces of said lens holder and restrain ends of winding of at leasteither said focusing coil or tracking coil, and a plurality ofsuspension wires made of conductive material, wherein said lens holderhas a reinforcing rib which contacts with at least a part of the portionof said support printed board protruding from said lens holder.

The lens holder of the objective lens driving apparatus according tothis invention has a reinforcing rib for supporting the coil restrainingpart of the support printed board.

This can prevent the coil restraining part of the support printed boardfrom causing undesired resonance and unnecessary disturbance in phase.

This invention has the effect of realizing the inexpensive objectivelens driving apparatus with high tracking sensitivity.

A second invention is the objective lens driving apparatus according tothe first invention characterized by that the surface of saidreinforcing rib that does not contact with the side surface of said lensholder forms an inclined plane with respect to the side surface of thelens holder, and winding of said coil restrained at said coilrestraining part is located along said inclined plane.

In the case that the whole back surface of the support printed board issupported by the reinforcing rib, the winding of the coil around thecoil restraining part can interfere physically with (contact with) theposition of inserting the suspension wire.

In the objective lens driving apparatus according to this invention, thesurface of said reinforcing rib that does not contact with the sidesurface of said lens holder forms an inclined plane with respect to theside surface of the lens holder (not parallel to the side surface ofsaid lens holder).

Winding of coil is disposed along the inclined plane, thereby preventingthe winding of coil from interfering with the insertion position of thesuspension wire.

According to this invention, the coil restraining part of the supportprinted board does not cause undesired resonance and unnecessarydisturbance in phase, and at the same time, it is possible to achievestable winding work of coil and stable insertion of the suspension wireduring assembly of the objective lens driving apparatus so that qualityof product in a factory can be improved.

This invention has the effect of realizing the inexpensive and easilymanufacturable objective lens driving apparatus with high trackingperformance.

Further, this invention has the effect of realizing the objective lensdriving apparatus in which the starting end and the terminating end ofthe coil wound by an automated winder are easily restrained.

A third invention is an objective lens driving apparatus of the firstinvention characterized by that winding of said coil is restrained atsaid restraining part by winding a turn or few turns around said supportprinted board and said reinforcing rib.

According to this invention, said support printed board and saidreinforcing rib can become integrated without adhesive so that the coilrestraining part of the support printed board does not cause undesiredresonance and unnecessary disturbance in phase.

This invention has the effect of realizing the inexpensive objectivelens driving apparatus with high tracking performance.

A fourth invention is an objective lens driving apparatus of the firstinvention or the third invention characterized by that said reinforcingrib part has a stepped portion or a grooved portion and winding of saidcoil which is restrained at said restraining part is located along saidstepped portion or said grooved portion.

This invention can prevent winding of the coil from interfering with theinsert position of the suspension wire.

Also, according to this invention, the coil restraining part of thesupport printed board does not cause undesired resonance and unnecessarydisturbance in phase, and at the same time, it is possible to achievestable winding work of coil and stable insertion of the suspension wireduring assembly of the objective lens driving apparatus so that qualityof product in a factory can be improved.

This invention has the effect of realizing the inexpensive and easilymanufacturable objective lens driving apparatus with high trackingperformance.

Further, this invention has the effect of realizing the objective lensdriving apparatus in which the starting end and the terminating end ofthe coil wound by an automated winder are easily restrained.

A fifth invention is an objective lens driving apparatus of any of thefirst invention to the third invention characterized by that saidsupport printed board has a plurality of notches and winding of saidcoil which is restrained at said restraining part is located along saidnotches.

This invention has the effect of realizing the objective lens drivingapparatus in which the starting end and the terminating end of the coilwound by an automated winder are easily restrained.

A sixth invention is an objective lens driving apparatus comprising anobjective lens, a lens holder for holding said objective lens, afocusing coil having a central axis substantially parallel to a focusingdirection of said objective lens, a tracking coil having a central axissubstantially parallel to a tracking direction of said objective lens, amagnet for generating a magnetic field in the vicinity of said focusingcoil and said tracking coil, a support printed board which protrudesfrom side surfaces of said lens holder and has a restraining part forrestraining end of winding of at least either said focusing coil or saidtracking coil, a plurality of suspension wires made of conductivematerial, and an adhesive which is applied to a corner part defined by aprotruded part of said support printed board from said lens holder and aside surface of said lens holder.

According to this invention, the coil restraining part of the supportprinted board does not cause undesired resonance and unnecessarydisturbance in phase.

This invention has the effect of realizing the inexpensive and easilymanufacturable objective lens driving apparatus with high trackingperformance.

A seventh invention is an objective lens driving apparatus of the sixthinvention characterized by that said lens holder has a bonded part withsaid support printed board, said bonded part comprising a firstdepression as an adhesive reservoir and a groove which extends from saidfirst depression to a base of said support printed board.

According to this invention, the coil restraining part of the supportprinted board does not cause undesired resonance and unnecessarydisturbance in phase.

Further, fixing firmly said support printed board by disposing so as topush said support printed board against said first depression, as wellas overflowing said adhesive to said corner part by extending saidadhesive along said groove of said lens holder which extends from saidfirst depression to said corner part can be achieved during a singleprocess. Therefore, the adhesive can be applied to said corner partwithout adding any new process. This invention has the effect ofrealizing the inexpensive and easily manufacturable objective lensdriving apparatus with high tracking performance.

A eighth invention is an objective lens driving apparatus of the sixthinvention characterized by that said lens holder comprises a seconddepression as an adhesive reservoir for bonding said objective lens, anda groove which extends from said second depression to a base of saidsupport printed board.

According to this invention, the coil restraining part of the supportprinted board does not cause undesired resonance and unnecessarydisturbance in phase.

Further, by disposing a member so as to push a member against saidsecond depression, said member and said objective lens are fixed firmly,and by extending said adhesive along said groove of said lens holderwhich extends from said first depression to said corner, said adhesivecan be overflowed to said corner part. Therefore, the adhesive can beapplied to said corner part without adding any new process.

This invention has the effect of realizing the inexpensive and easilymanufacturable objective lens driving apparatus with high trackingperformance.

A ninth invention is a manufacturing method of the objective lensdriving apparatus of the sixth invention comprising steps of dropping anadhesive into said first depression formed on said lens holder, andfixing firmly said support printed board by pushing said support printedboard against said first depression, as well as overflowing saidadhesive to said corner part by extending said adhesive along saidgroove of said lens holder which extends from said first depression tosaid corner part.

According to this invention, the adhesive can be applied to said cornerpart without adding any new process. As a result, the coil restrainingpart of the support printed board does not cause undesired resonance andunnecessary disturbance in phase.

This invention has the effect of realizing the inexpensive manufacturingmethod for manufacturing the objective lens driving apparatus with hightracking performance.

A tenth invention is a manufacturing method of the objective lensdriving apparatus of the sixth invention comprising steps of dropping anadhesive into said second depression formed on said lens holder, andfixing firmly said objective lens by pushing a member against saidsecond depression, as well as overflowing said adhesive to said cornerpart by extending said adhesive along said groove of said lens holderwhich extends from said second depression to said corner part.

According to this invention, the adhesive can be applied to said cornerpart without adding any new process. As a result, the coil restrainingpart of the support printed board does not cause undesired resonance andunnecessary disturbance in phase.

This invention has the effect of realizing the inexpensive manufacturingmethod for manufacturing the objective lens driving apparatus with hightracking performance.

“Member” means an optional member. Typically, it is a lens protector(FIG. 13 (b) and FIG. 13(c).

The novel features of the invention will be hereinafter fully describedand particularly pointed out in the appended claims, and theconfiguration and details of the invention, together with other objectsand features thereof, will become better understood and appreciated byreference to the following detailed description when considered inconjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1(a) is a front view of the objective lens driving apparatus ofembodiment 1. FIG. 1(b) is a sectional view taken along the A—A line ofFIG. 1(a). FIG. 1(c) is a sectional view taken along the B—B line of aFIG 1(a).

FIG. 2 is a perspective view in schematic form depicting theconfiguration of the reinforcing rib of the objective lens drivingapparatus of embodiment 1.

FIG. 3 is a graph showing frequency characteristic of the objective lensdriving apparatus of embodiment 1.

FIG. 4(a) is a front view of a movable section of the objective lensdriving apparatus of embodiment 2. FIG. 4(b) is a sectional view takenalong the A—A line of FIG. 4(a).

FIG. 5 is a perspective view in schematic form depicting theconfiguration of the reinforcing rib of the objective lens drivingapparatus of embodiment 2.

FIG. 6(a) is a front view of a movable section of the objective lensdriving apparatus of embodiment 3. FIG. 6(b) is a sectional view takenalone the A—A line of FIG. 6(b).

FIG. 7 is a perspective view in schematic form depicting theconfiguration of the reinforcing rib of the objective lens drivingapparatus of embodiment 3.

FIG. 8(a) is a front view of a movable section of the objective lensdriving apparatus of embodiment 4. FIG. 8(b) is a front view and asectional view taken alone the A—A line of FIG. 8(a).

FIG. 9 is a perspective view in schematic form depicting theconfiguration of the reinforcing rib of the objective lens drivingapparatus of embodiment 4.

FIG. 10 is a front view of a movable section of the objective lensdriving apparatus of embodiment 5. FIG. 10(b) is a bottom view of FIG.10(a). FIG. 10(c) is a sectional view taken along the B—B line of FIG.10(a).

FIG. 11(a) is a perspective view in schematic form depicting theconfiguration of the reinforcing rib of the objective lens drivingapparatus of embodiment 5. FIG. 11(b) and FIG. 11(c) depict amanufacturing method for manufacturing the objective lens drivingapparatus of embodiment 5.

FIG. 12 is a front view of a movable section of the objective lensdriving apparatus of embodiment 6.

FIG. 13(a) is a perspective view in schematic form depicting theconfiguration of the reinforcing rib of the objective lens drivingapparatus of embodiment 6. FIG. 13(b) and FIG. 13(c) depict amanufacturing method for manufacturing the objective lens drivingapparatus of embodiment 6.

FIG. 14 is a view depicting the configuration of the conventionalobjective lens driving apparatus.

It is noted that a part or whole of the figures are schematicallydepicted for diagrammatic representation and they do not necessarilyreflect actual relative size and position of components shown therein.

BEST MODE FOR EMBODYING THE INVENTION

Embodiments which makes a concrete explanation of best mode forembodying the present invention will be described herein after with theappended figures. However, the present invention is not limited to thefollowing embodiments unless it exceeds the extent of the spirit.

<<Embodiment 1>>

Referring to FIG. 1 to FIG. 3, an objective lens driving apparatus ofembodiment 1 according to the present invention will be explained.

First, the vibration characteristic of the objective lens drivingapparatus will be explained.

FIG. 3 shows the frequency characteristic of displacement gain in thetracking direction with respect to the objective lens driving apparatus.The peak frequency having the highest displacement gain in the wholefrequency range is referred to as primary resonance and the peakfrequency in higher frequency range is referred to as high orderresonance.

And, undesired resonance appearing in proximity to 10 kHz in the drawingis caused by self-resonance of a support printed board.

On the basis of gain crossover frequency fx shown in the drawing,low-frequency side indicates servo frequency range of the objective lensdriving apparatus (i.e. the frequency range in which vibration, errorand so on can be suppressed by controlling the objective lens drivingapparatus), and high-frequency side indicates non-servo frequency range(i.e. high-frequency range in which the objective lens driving apparatusgives no response).

In the presence of undesired resonance in the non-servo frequency range,when coil current exceeding minimum track displacement is applied,tracking cannot be carried out with tracking accuracy in the objectivelens driving apparatus, potentially resulting in an off-track state.

However, as servo operation is not performed in this frequency range,the displacement is kept uncontrolled and off-track state cannot beresolved.

In equipment using objective lens driving apparatus (e.g., DVD device),a phase compensating filter ensures phase margin of 35° to 60° known asstable for servo control in gain crossover frequency range. At thattime, the presence of phase disturbance due to undesired resonance caninterfere with the provision of the phase margin. Therefore, undesiredresonance in non-servo frequency range deteriorates tracking performanceof tracking control in the optical disk apparatus. Further, it causesunnecessary electricity consumption.

As described above, in order to achieve an optical disk apparatus withhigh tracking performance, it is highly important to suppressself-resonance of a support printed board.

For this purpose, in the objective lens driving apparatus of embodiment1, a lens holder 13 has four reinforcing ribs 13 a so as to suppressself-resonance of the support printed board.

The remaining structure of the apparatus is the same as thecorresponding structure of the above-mentioned conventional objectivelens driving apparatus.

FIG. 1(a) shows a front view, FIG. 1(b) shows a sectional view takenalong the A—A line and FIG. 1(c) shows a sectional view taken along theB—B line of a movable section of the objective lens driving apparatus ofembodiment 1 according to the present invention. FIG. 2 shows aperspective view in schematic form depicting the configuration of thereinforcing rib 13 a of the objective lens driving apparatus ofembodiment 1 (The reinforcing rib 13 a is represented larger than life.)

The movable section means movable parts held by a suspension wires 9 inthe objective lens driving apparatus, including an objective lens 1, thelens holder 13, a focusing coil 3, a tracking coil 4, support printedboards 5, and the suspension wires 9.

As parts other than the movable parts are the same as the correspondingparts of the above-mentioned conventional objective lens drivingapparatus, description is omitted.

In the objective lens driving apparatus of embodiment 1, parts exceptfor the four reinforcing ribs 13 a of the lens holder and placement ofwindings of coils (the focusing coil 3 and the tracking coil 4) are thesame as the corresponding parts of the conventional objective lensdriving apparatus, these parts are identified by the same referencenumbers. Description thereof is omitted.

As shown in FIG. 1 (b) and FIG. 2, the reinforcing rib 13 a of the lensholder 13 closely contacts with the support printed board 5 protrudingfrom the side surfaces of the lens holder (front surface and backsurface) (both ends of each of two support printed boards protrude fromthe side surfaces of the lens holder, respectively (at four locations intotal)), thereby reinforcing the base of the support printed board 5.Preferably, the contact surfaces of the support printed board 5 and thereinforcing rib 13 a are fixed to each other by adhesive.

A surface of the reinforcing rib that does not contact with the sidesurface of the lens holder forms an inclined plane with respect to theside surface of the lens holder. The reinforcing rib 13 a of embodiment1 is shaped like a triangle pole with a right triangular cross section,and the contact surface with the printed board is shaped like said righttriangle.

Regarding a base side (the same plane surface as the side surface of thelens holder) as a bottom line of said triangle (one of the lines makinga right angle), an apex of the triangle (the furthermost position fromthe side surface of the lens holder) is located in the vicinity of acoil restraining part of the support printed board (located near thefront end of the support printed board).

Cross section of the reinforcing rib may be shaped like a trapezoid inplace of a triangle. A trapezoidal surface of the reinforcing rib thatdoes not contact with the side surface of the lens holder forms aninclined plane with respect to the side surface of the lens holder.

Referring to FIG. 1(b) (a sectional view viewed from right side alongthe A—A line of the front view of FIG. 1(a)) and FIG. 2, arrangementmethod of windings of coils will be explained hereinafter.

Winding of the focusing coil 3 is wound a few turns along the coilrestraining part 5 a located in the vicinity of the front end of thesupport printed board for restraining (the starting end part of thefocusing coil 3 is formed), and after that, the winding drawn from saidstaring end part is located along the inclined plane of the reinforcingrib 13 a in the shape of a right triangle as a guideline.

The winding located along the inclined plane is led to a focusing coilwinding part of the lens holder 13 having reinforcing ribs. After that,the winding is wound on it to form the focusing coil 3.

On the completion of winding up, the winding is located along theinclined plane of the reinforcing rib 13 a at the side of a coilrestraining part 5 b as a guideline.

The winding located along the inclined plane is led to the coilrestraining part 5 b located in the vicinity of the front end of thesupport printed board and is wound a few turns along the coilrestraining part 5 b for restraining (the terminating end part of thefocusing coil 3 is formed).

Similarly, the tracking coil 4 is also located along the inclined planesof other two reinforcing ribs as guidelines and wound on a tracking coilwinding part of the lens holder 13 having the reinforcing ribs.

Referring to FIG. 1(c), a cross sectional view taken along the B—B lineof FIG. 1(a), wiring paths 3 a and 3 b of the focusing coil 3 betweenthe coil restraining part 5 a of the support printed board 5 and thefocusing coil winding part of the lens holder 13 having the reinforcingribs will be described.

In the conventional objective lens driving apparatus, owing to theabsence of reinforcing rib (as there is no guideline for coil), when thewinding is wound by an automated winder, the shortest path 3 a of wiringis likely to be selected.

However, this raises a possibility that the shortest path 3 a contactswith the suspension wire 9 (the shortest path 3 a interferes with thesuspension wire 9) Assembly process of the objective lens drivingapparatus includes the inserting process of the suspension wire 9following the above-mentioned winding process. Therefore, when thesuspension wire contacts with the focusing coil, there is possibility ofa failure to insert the wire.

On the contrary, in the objective lens driving apparatus of embodiment1, the wiring path of the focusing coil 3 is guided by the reinforcingribs so as to be fixed at the path 3 b.

On the wiring path 3 b, the winding does not contact with the suspensionwire 9. Accordingly, the above-mentioned problem does not occur duringassembly process, thereby facilitating assembly of the objective lensdriving apparatus and improving quality of product in a factory.

Next, the results of the present embodiment will be described. By usingthe lens holder with reinforcing ribs in the shape of right triangle,undesired resonance of 6 dB (12 kHz) disappears and high order resonancemargin (difference between displacement gain of 1 kHz and peak of highorder resonance) is improved from 40 dB to 45 dB.

This promotes the tracking performance of the objective lens drivingapparatus for the optical data recording medium.

Further, it enables a stable arrangement of the starting ends and theterminating ends of coils by automated winder (arrangement forrestraining the starting end and the terminating end of winding of thecoil at the support printed board), as well as insertion of thesuspension wire.

<<Embodiment 2>>

Referring to FIG. 4 and FIG. 5, an objective lens driving apparatus ofembodiment 2 according to the present invention will be explained.

In order to suppress self-resonance of a support printed board, theobjective lens driving apparatus of embodiment 2 comprises a lens holder14 having four reinforcing ribs and a support printed board 15 with aplurality of notches. The reinforcing rib 14 a is different from that ofembodiment 1 in shape.

The remaining structure of the apparatus is the same as thecorresponding structure of the above-mentioned conventional objectivelens driving apparatus.

FIG. 4(a) shows a front view, and FIG. 4(b) shows a sectional view takenalong the A—A line of a movable section of the objective lens drivingapparatus of embodiment 2. FIG. 5 shows a perspective view in schematicform depicting the configuration of the reinforcing rib 14 a of theobjective lens driving apparatus of embodiment 2. (The reinforcing ribis presented larger than life.)

The movable section means movable parts held by suspension wires 9 inthe objective lens driving apparatus, including the objective lens 1,the lens holder 14, the focusing coil 3, the tracking coil 4, thesupport printed boards 15, and the suspension wires 9.

As parts other than the movable parts are the same as the correspondingparts of the above-mentioned conventional objective lens drivingapparatus, description is omitted.

In the objective lens driving apparatus of embodiment 2, parts exceptfor four reinforcing ribs 14 a of the lens holder, plural notches of thesupport printed board 15 and placement of windings of coils (thefocusing coil 3 and the tracking coil 4) are the same as thecorresponding parts of the conventional objective lens drivingapparatus, these parts are identified by the same reference numbers.Description thereof is omitted.

As shown in FIG. 5, the reinforcing rib 14 a of the lens holder 14 withreinforcing ribs closely contacts with the support printed board 15protruding from the side surfaces of the lens holder (front surface andback surface) (both ends of each of two support printed boards protrudefrom the side surfaces of the lens holder, respectively (at fourlocations in total)), thereby reinforcing the base of the supportprinted board 15.

At four coil restraining parts, the starting ends and the terminatingends of windings of the focusing coil 3 and the tracking coil 4 arefixed.

In embodiment 2, the contact surfaces of the support printed board 15and the reinforcing rib 14 a may be fixed to each other by adhesive ormay not be fixed.

At the coil restraining part, winding of a coil is wound a few turnsaround the reinforcing rib 14 a and the support printed board 15 withnotches so as to tie the reinforcing rib 14 a and the support printedboard 15 with notches in bundle. In this way, the reinforcing rib 14 aand the support printed board 15 with notches are firmly fixed to eachother by winding of the coil.

With this configuration, resonance of the support printed board withnotches 15 can be suppressed by the reinforcing rib 14 a.

The reinforcing rib 14 a is formed so as to have the same height as thesupport printed board 15 and the same width as or narrower width thanthe notched portion of the support printed board 15. The support printedboard 15 with notches comprises a plurality of notches 15 b and 15 c(the notch may be single) in addition to the coil restraining parts 15 aand 15 d.

Referring to FIG. 4(b) (a sectional view viewed from right side alongthe A—A line of the front view of FIG. 4(a)) and FIG. 5 arrangementmethod of winding of coils will be explained hereinafter.

At the coil restraining part 15 a in the vicinity of the front end ofthe support printed board, winding of the focusing coil 3 is wound a fewturns around the reinforcing rib 14 a and the support printed board 15with notches so as to tie the reinforcing rib 14 a and the supportprinted board 15 with notches in bundle for restraining (the startingend part of the focusing coil 3 is formed), and after that, the windingdrawn from said staring end part is led to the focusing coil windingpart of the lens holder 14 having reinforcing ribs through the notch 15b of the support printed board with notches (being guided by the notch15 b). After that, the winding is wound on it to form the focusing coil3. On the completion of winding work, the winding is led to the coilrestraining part 15 d through the notch 15 c of the support printedboard with notches (being guided by the notch 15 c).

At the coil restraining part 15 d, winding of the focusing coil 3 iswound a few turns around the reinforcing rib and the support printedboard 15 with notches so as to tie the reinforcing rib and the supportprinted board 15 with notches in bundle for restraining (the terminatingend part of the focusing coil 3 is formed).

Similarly, winding of the tracking coil 4 is also wound a few turnsaround the reinforcing rib and the support printed board 15 with notchesfor restraining, and after that, the restrained winding is led to thetracking coil winding part of the lens holder 14 with reinforcing ribsusing the notches 15 b and 15 c of the support printed board withnotches as guides. The winding is wound on said tracking coil windingpart.

In the objective lens driving apparatus of embodiment 2, a wiring pathof the focusing coil 3 is guided by the notches 15 b and 15 c of thesupport printed board with notches so as to be fixed at the path 3 b (asectional view taken along the B—B line of FIG. 1(a) depicted in FIG.1(c).

On the wiring path 3 b, the winding does not contact with the suspensionwire 9. Accordingly, no problem occurs during assembly process, therebyfacilitating assembly of the objective lens driving apparatus andimproving quality of product in a factory.

According to this embodiment, undesired resonance of 6 dB (12 kHz)disappears and high order resonance margin (difference betweendisplacement gain of 1 kHz and peak of high order resonance) is improvedfrom 40 dB to 45 dB.

This promotes tracking performance of the objective lens drivingapparatus for the optical data recording medium.

Further, it enables a stable arrangement of the starting ends and theterminating ends of windings of the coils by automated winder(arrangement for restraining the starting ends and the terminating endsof windings of the coils at the support printed board), as well asinsertion of the suspension wire.

<<Embodiment 3>>

Referring to FIG. 6 and FIG. 7, an objective lens driving apparatus ofembodiment 3 according to the present invention will be explained.

In order to suppress self-resonance of a support printed board, theobjective lens driving apparatus of embodiment 3 comprises a lens holder16 having four reinforcing ribs. The reinforcing rib 16 a is differentfrom that of embodiment 1 or embodiment 2 in shape.

The remaining structure of the apparatus is the same as thecorresponding structure of the above-mentioned conventional objectivelens driving apparatus.

FIG. 6(a) shows a front view, and FIG. 6(b) shows a sectional view takenalong the A—A line of FIG. 6(a) of a movable section of the objectivelens driving apparatus of embodiment 3. FIG. 7 shows a perspective viewin schematic form depicting the configuration of the reinforcing rib 16a of the objective lens driving apparatus of embodiment 3. (Thereinforcing rib is represented larger than life.)

The movable section means movable parts held by the suspension wires 9in the objective lens driving apparatus, including the objective lens 1,the lens holder 16, the focusing coil 3, the tracking coil 4, thesupport printed boards 5, and the suspension wires 9.

As parts other than the movable parts are the same as the correspondingparts of the above-mentioned conventional objective lens drivingapparatus, description is omitted.

In the objective lens driving apparatus of embodiment 3, parts exceptfor the four reinforcing ribs 16 a of the lens holder and placement ofwindings of coils (the focusing coil 3 and the tracking coil 4) are thesame as the corresponding parts of the conventional objective lensdriving apparatus, these parts are identified by the same referencenumbers. Description thereof is omitted.

As shown in FIG. 7, the reinforcing rib 16 a of the lens holder 16closely contacts with the support printed board 5 protruding from theside surfaces of the lens holder (front surface and back surface) (bothends of each of two support printed boards protrude from the sidesurfaces of the lens holder, respectively (at four locations in total)),thereby reinforcing the base of the support printed board.

At four coil restraining parts, each of the starting ends and theterminating ends of windings of the focusing coil 3 and the trackingcoil 4 are fixed, respectively.

In embodiment 3, the contact surfaces of the support printed board andthe reinforcing rib may be fixed to each other by adhesive or may not befixed.

At the coil restraining part, winding of a coil is wound a few turnsaround the reinforcing rib 16 a and the support printed board 5 so as totie the reinforcing rib 16 a and the support printed board 5 in bundle.In this way, the reinforcing rib 16 a and the support printed board 5are firmly fixed to each other by winding of the coil.

With this configuration, resonance of the support printed board can besuppressed by the reinforcing rib.

The reinforcing rib 16 a is formed so as to have the same height as thesupport printed board 5 and the same width as or narrower width than thenotched portion of the support printed board.

Referring to FIG. 6(b) (a sectional view viewed from right side alongthe A—A line of the front view of FIG. 6(a) and FIG. 7, arrangementmethod of windings of coils will be explained hereinafter.

At the coil restraining part 5 a in the vicinity of the front end of thesupport printed board, winding of the focusing coil 3 is wound a fewturns around the reinforcing rib 16 a and the support printed board 5 soas to tie the reinforcing rib 16 a and the support printed board 5 inbundle for restraining (the starting end part of the focusing coil 3 isformed), and after that, the winding drawn from said staring end part islocated along an inclined plane (a plane which is not parallel to a sidesurface of the lens holder) of upper part of a stepped portion formed onthe reinforcing rib 16 a (being guided by the inclined plane) and thenis led to the focusing coil winding part of the lens holder 16. Afterthat, the winding is wound on it to form the focusing coil 3.

On the completion of the winding work, the winding is located along aninclined plane of upper part of a stepped portion formed on thereinforcing rib 16 a (being guided by the inclined plane) and then isled to the coil restraining part 15 b in the vicinity of the front endof the support printed board.

At the coil restraining part 5 b, winding of the focusing coil 3 iswound a few turns around the reinforcing rib 16 a and the supportprinted board 5 so as to tie the reinforcing rib 16 a and the supportprinted board 5 in bundle for restraining (the terminating end part ofthe focusing coil 3 is formed).

Similarly, winding of the tracking coil 4 is also wound a few turnsaround the reinforcing rib 16 a and the support printed board 5 forrestraining by using a grooved portion of the reinforcing rib 16 a as aguide, and then is led to the tracking coil winding part of the lensholder for winding.

In the objective lens driving apparatus of embodiment 3, a wiring pathof the focusing coil 3 is guided by the inclined plane of the upper partof the stepped portion formed on the reinforcing rib so as to be fixedat the path 3 b (a sectional view taken along the B—B line of FIG. 1).

On the wiring path 3 b, the winding does not contact with the suspensionwire 9. Accordingly, no problem occurs during assembly process, therebyfacilitating assembly of the objective lens driving apparatus andimproving quality of product in a factory.

According to this embodiment, undesired resonance of 6 dB (12 kHz)disappears and high order resonance margin (difference betweendisplacement gain of 1 kHz and peak of high order resonance) is improvedfrom 40 dB to 45 dB.

This promotes tracking performance of the objective lens drivingapparatus for the optical data recording medium.

Further, it enables a stable arrangement of the starting ends and theterminating ends of windings of the coils by automated winder(arrangement for restraining the starting ends and the terminating endsof windings of the coils at the support printed board), as well asinsertion of the suspension wire.

<<Embodiment 4>>

Referring to FIG. 8 and FIG. 9, an objective lens driving apparatus ofembodiment 4 according to the present invention will be explained.

In order to suppress self-resonance of a support printed board, theobjective lens driving apparatus of embodiment 4 comprises a lens holder17 having four reinforcing ribs. The reinforcing rib 17 a is differentfrom that of embodiment 1, embodiment 2 or embodiment 3 in shape.

The remaining structure of the apparatus is the same as thecorresponding structure of the above-mentioned conventional objectivelens driving apparatus.

FIG. 6(a) shows a front view (a), and FIG. 6(b) shows a sectional viewtaken along the A—A line of a movable section of the objective lensdriving apparatus of embodiment 4. FIG. 9 shows a perspective view inschematic form depicting the configuration of the reinforcing rib 17 aof the objective lens driving apparatus of embodiment 4. (Thereinforcing rib is represented larger than life.)

The movable section means movable parts held by the suspension wires 9in the objective lens driving apparatus, including the objective lens 1,the lens holder 17, the focusing coil 3, the tracking coil 4, thesupport printed boards 5, and the suspension wires 9.

As parts other than the movable parts are the same as the correspondingparts of the above-mentioned conventional objective lens drivingapparatus, description is omitted.

In the objective lens driving apparatus of embodiment 4, parts exceptfor the four reinforcing ribs 17 a of the lens holder and placement ofwindings of coils (the focusing coil 3 and the tracking coil 4) are thesame as the corresponding parts of the conventional objective lensdriving apparatus, these parts are identified by the same referencenumbers. Description thereof is omitted.

As shown in FIG. 9, the reinforcing rib 17 a of the lens bolder 17closely contacts with the support printed board 5 protruding from theside surfaces of the lens holder (front surface and back surface) (bothends of each of two support printed boards protrude from the sidesurfaces of the lens holder, respectively (at four locations in total)),thereby reinforcing the base of the support printed board.

At four coil restraining parts, the starting ends and the terminatingends of windings of the focusing coil 3 and the tracking coil 4 arefixed.

In embodiment 4, the contact surfaces of the support printed board andthe reinforcing rib may be fixed to each other by adhesive or may not befixed.

At the coil restraining part, winding of a coil is wound a few turnsaround the reinforcing rib 17 a and the support printed board 5 so as totie the reinforcing rib and the support printed board 5 in bundle. Inthis way, the reinforcing rib 17 a and the support printed board 5 arefirmly fixed to each other by the winding of the coil.

With this configuration, resonance of the support printed board 5 can besuppressed by the reinforcing rib.

The reinforcing rib 17 a is formed so as to have the same height as thesupport printed board 5 and the same width as or narrower width than thenotched portion of the support printed board.

Referring to FIG. 8(b) (a sectional view viewed from right side alongthe A—A line of the front view of FIG. 8(a)) and FIG. 9, arrangementmethod of windings of coils will be explained hereinafter.

At the coil restraining part 5 a in the vicinity of the front end of thesupport printed board, winding of the focusing coil 3 is wound a fewturns around the reinforcing rib 17 a and the support printed board 5 soas to tie the reinforcing rib 17 a and the support printed board 5 inbundle for restraining (the starting end part of the focusing coil 3 isformed), and then, the winding drawn from said staring end part is ledto the focusing coil winding part of the lens holder 17 through agrooved portion formed on the reinforcing rib 17 a. After that, thewinding is wound on it to form the focusing coil 3.

On the completion of the winding work, the winding is led to the coilrestraining part 5 b in the vicinity of the front end of the supportprinted board through the grooved portion formed on the reinforcing rib17 a (being guided by the grooved portion).

At the coil restraining part 5 b, winding of the focusing coil 3 iswound a few turns around the reinforcing rib 17 a and the supportprinted board 5 so as to tie the reinforcing rib 17 a and the supportprinted board 5 in bundle for restraining (the terminating end part ofthe focusing coil 3 is formed).

Similarly, winding of the tracking coil 4 is also wound a few turnsaround the reinforcing rib 17 a and the support printed board 5 forrestraining, being guided by the grooved portion of the reinforcing rib17 a as a guide, and then is wound on the tracking coil winding part ofthe lens holder 17 with reinforcing ribs.

In the objective lens driving apparatus of embodiment 4, a wiring pathof the focusing coil 3 is guided by the groove of the reinforcing rib soas to be fixed at the path 3 b (as shown in FIG. 1(c) which is asectional view taken along the B—B line of FIG. 1(a)).

On the wiring path 3 b, the winding does not contact with the suspensionwire 9. Accordingly, no problem occurs during assembly process, therebyfacilitating assembly of the objective lens driving apparatus andimproving quality of product in a factory.

According to this embodiment, undesired resonance of 6 dB (12 kHz)disappears and high order resonance margin (difference betweendisplacement gain of 1 kHz and peak of high order resonance) is improvedfrom 40 dB to 45 dB.

This promotes tracking performance of the objective lens drivingapparatus for the optical data recording medium.

Further, it enables a stable arrangement of the starting ends and theterminating ends of windings of the coils by automated winder(arrangement for restraining the starting ends and the terminating endsof windings of the coils at the support printed board), as well asinsertion of the suspension wire.

<<Embodiment 5>>

Referring to FIG. 10 and FIG. 11, an objective lens driving apparatus ofembodiment 5 according to the present invention will be explained.

In the objective lens driving apparatus of embodiment 5, an adhesive isapplied to the corner part formed by the part of the support printedboard 5 which protrudes from said lens holder and the side surface ofthe lens holder 18 in order to suppress self-resonance of the supportprinted board. Further, the lens holder 18 has a pasted part with saidsupport printed board 5.

The above-mentioned pasted part has a first depression as an adhesivereservoir and a groove which extends from the above-mentioned firstdepression to a base of the above-mentioned support printed board.

The remaining structure of the apparatus is the same as thecorresponding structure of the above-mentioned conventional objectivelens driving apparatus.

FIG. 10(a) shows a front view, and FIG. 10(b) shows a right side view(showing the appearance of the apparatus from which the support printedboard 5 is removed), and FIG. 10 (c) shows a sectional view taken alongthe B—B line of a movable section of the objective lens drivingapparatus of embodiment 5. FIG. 11(a) shows a perspective view inschematic form depicting the configuration of the reinforcing rib of theobjective lens driving apparatus of embodiment 5. (The reinforcing ribis represented larger than life.), and FIG. 11(b) and FIG. 11(c) showthe manufacturing method of the objective lens driving apparatusaccording to this invention.

The movable section means movable parts held by the suspension wires 9in the objective lens driving apparatus, including the objective lens 1,the lens holder 18, the focusing coil 3, the tracking coil 4, thesupport printed boards 5, and the suspension wires 9.

As parts other than the movable parts are the same as the correspondingparts of the above-mentioned conventional objective lens drivingapparatus, description is omitted.

As shown in the right side view of FIG. 10 and FIG. 11, the lens holder18 comprises a first depression 18 a and a groove 18 b on the bottom (anapplied area of adhesive for bonding of the support printed board 5 withthe lens holder 18). Both of the bonded parts (two locations) of twosupport printed boards are same in configuration.

In FIG. 11(b), the adhesive 19 a is mounted on the first depression 18 aenough to bulge and immediately afterward, the support printed board 5is pushed onto it in the direction shown by an arrow 20.

By pushing off the support printed board 5, the adhesive 19 a extendsalong the groove.

As a result, as shown in FIG. 11(c), the support printed board 5 isstuck and fixed to the bottom surface of the lens holder.

Further, the adhesive extending along the groove overflows into thecorner part defined by the part of the support printed board 5 whichprotrudes from said lens holder and the side surfaces (front surface andback surface) of said lens holder 18 (the end part of the groove leadsup to the corner part).

The overflowed adhesive 19 b becomes hardened at the corner part,thereby reinforcing the base of the support printed board andsuppressing self-resonance of the support printed board 5.

According to this embodiment, undesired resonance of 6 dB (12 kHz)disappears and high order resonance margin (difference betweendisplacement gain of 1 kHz and peak of high order resonance) is improvedfrom 40 dB to 45 dB.

This promotes tracking performance of the objective lens drivingapparatus for the optical data recording medium.

Further, the manufacturing method enables reinforcement of the base ofthe support printed board without adding any new process.

<<Embodiment 6>>

Referring to FIG. 12 and FIG. 13, an objective lens driving apparatus ofembodiment 6 according to the present invention will be explained.

In the objective lens driving apparatus of embodiment 6, an adhesive isapplied to the corner part formed by the part of the support printedboard 5 which protrudes from said lens holder and the side surface(front surface) of a lens holder 21 in order to suppress self-resonanceof the support printed board.

A lens 1 is fitted to the lens holder 21. On the front surface, a seconddepression 21 a and a groove 21 b which extends from the seconddepression 21 a to the lens 1 and said corner part, respectively, areformed. (FIG. 12).

The remaining structure of the apparatus is the same as thecorresponding structure of the above-mentioned conventional objectivelens driving apparatus.

FIG. 12 shows a front view of a movable section of the objective lensdriving apparatus of embodiment 6. FIG. 13(a) shows a perspective viewin schematic form depicting the configuration of the reinforcing rib ofthe objective lens driving apparatus of embodiment 6 (The reinforcingrib is represented larger than life.), and FIGS. 13(b) and (c) show themanufacturing method of the objective lens driving apparatus accordingto the present invention.

The movable section means movable parts held by the suspension wires 9in the objective lens driving apparatus, including the objective lens 1,the lens holder 21, the focusing coil 3, the tracking coil 4, thesupport printed boards 5, the suspension wires 9, and a lens protector23 (The lens protector 23 is shown in FIG. 13).

As parts other than the movable parts are the same as the correspondingparts of the above-mentioned conventional objective lens drivingapparatus, description is omitted.

In FIG. 13(b), adhesive 22 a is mounted on the second depression 21 aenough to bulge and immediately afterward, the lens protector 23 ispushed onto it in the direction shown by an arrow 24.

By pushing off the lens protector 23, the adhesive 22 a extends alongthe groove.

As a result, as shown in FIG. 13(c), the lens protector 23 is stuck andfixed to the front surface of the lens holder.

The adhesive which extends along the groove 21 b reaches thecircumference of the objective lens 1 so as to fix the objective lens tothe lens holder.

Further, the adhesive which extends along the groove 21 b overflows intothe corner part formed by the part of the support printed board 5 whichprotrudes from said lens holder and the side surfaces of said lensholder 21 (The end part of the groove leads up to the corner part).

The overflowed adhesive 22 b becomes hardened at the corner part,thereby reinforcing the base of the support printed board andsuppressing self-resonance of the support printed board 5.

Moreover, in embodiment 6, only the base of the support printed boardprotruding from the front surface of the lens holder is reinforced.Therefore, with respect to the reinforcement of the base of the supportprinted board protruding from the back surface of the lens holder, it isdesirable to adopt the method in embodiment 5 and so on.

According to this embodiment, undesired resonance of 6 dB (12 kHz)disappears and high order resonance margin (difference betweendisplacement gain of 1 kHz and peak of high order resonance) is improvedfrom 40 dB to 45 dB.

This promotes tracking performance of the objective lens drivingapparatus for the optical data recording medium.

The lens protector 23 is made of soft molding material such as DURACON(registered trademark) and tubular part thereof protrudes furtherforward than the front surface of the lens.

In the case where an optical pickup operates irregularly, the soft lensprotector 23 hits against the recording medium, but the objective lens 1which is located at the position recessed from the front surface of thelens protector does not hit against the recording medium.

The lens protector 23 protects the recording medium and the objectivelens 1 from possible breakage in the above-mentioned way. Therefore, thelens protector 23 is useful in itself and it is not a new addedcomponent for the purpose of reinforcing the support printed board 5 inthe present invention.

The object lens driving apparatus of embodiment 6 has the effect ofachieving the object lens driving apparatus with high trackingperformance without adding any new component.

Further, by the above-mentioned manufacturing method, the base of thesupport printed board 5 protruding forward can be reinforced withoutadding any new process.

According to this invention, the coil restraining part of the supportprinted board does not cause undesired resonance and unnecessarydisturbance in phase, and it is therefore possible to obtain theadvantageous effect of achieving the inexpensive and easilymanufacturable objective lens driving apparatus with high trackingperformance.

Furthermore, according to this invention, it is possible to obtain theadvantageous effect of achieving the objective lens driving apparatus inwhich the starting end and the terminating end of winding of the coilwounded by an automated winder are easy to be restrained.

According to this invention, it is possible to obtain the advantageouseffect of achieving the inexpensive manufacturing method of theobjective lens driving apparatus with high tracking performance withoutadding any new manufacturing process.

While preferred embodiments have been described of the invention with acertain degree of particularity, it is understood that the presentdisclosure of the preferred embodiments have been changed in the detailsof construction and the varied combination and arrangement of parts maybe achieved without departing from the scope and the spirit of theclaimed invention.

INDUSTRIAL APPLICABILITY

The objective lens driving apparatus and manufacturing method thereof ofthe present invention are applicable as the objective lens drivingapparatus and its manufacturing method for performing focusing andtracking with respect to optical data recording medium (for example, DVDdisc).

1. An objective lens driving apparatus comprising: an objective lens; a lens holder for holding said objective lens; a focusing coil having a central axis substantially parallel to a focusing direction of said objective lens; a tracking coil having a central axis substantially parallel to a tracking direction of said objective lens; a magnet for generating a magnetic field in the vicinity of said focusing coil and said tracking coil; a support printed board which protrudes from a side surface of said lens holder and has a restraining part for restraining winding of at least said focusing coil or said tracking coil; and a plurality of suspension wires made of conductive material, wherein said lens holder has a reinforcing rib which at least partially contacts a part of said support printed board protruding from said lens holder.
 2. c objective lens driving apparatus of claim 1, wherein a surface of said reinforcing rib which is not in contact with a side surface of said lens holder forms an inclined plane with respect to said side surface of said lens holder and winding of said coil which is restrained by at said coil restraining part is located along said inclined plane.
 3. The objective lens driving apparatus of claim 2, wherein said support printed board has a plurality of notches and winding of said coil which is restrained at said restraining part is located along said notches.
 4. The objective lens driving apparatus of claim 1, wherein said support printed board has a plurality of notches and winding of said coil which is restrained at said restraining part is located along said notches. 